CVE-2023-45612 XML external entity in Ktor

What is CVE-2023-45612?

CVE-2023-45612 is a high-severity vulnerability in JetBrains Ktor, published on 9 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE

Weakness: CWE-611

Which versions are affected by CVE-2023-45612?

It affects 1 product.

Products include Jetbrains Ktor.

How do I fix CVE-2023-45612?

No fix has been published for CVE-2023-45612 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-45612 being exploited?

There is no known exploitation of CVE-2023-45612 in the wild and no public exploit code.

Public exploit code: 7 proofs of concept on GitHub.

Other vulnerabilities in JetBrains Ktor

• CVE-2019-12736 Command injection in n/a Critical 9.8
• CVE-2022-29930 SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value. High 8.7
• CVE-2022-48476 Path traversal in Ktor High 7.5
• CVE-2021-43203 Auth bypass in n/a High 7.5
• CVE-2023-45613 Security feature bypass in Ktor Medium 6.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q42m-mp58-hxv5.